Reportable Segments and Geographic Data (Schedule of Financial Data by Reporting Segment) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 251,600	$ 251,900	$ 255,400	$ 223,600	$ 226,700	$ 222,100	$ 215,600	$ 199,300	$ 213,000	$ 191,300	$ 203,200	$ 172,300	$ 982,479	$ 863,717	$ 779,839
Depreciation and amortization													79,036	71,956	67,461
Operating income (loss)	$ 37,400	$ 40,800	$ 42,200	$ 17,000									137,408	78,676	94,132
Interest income													(2,118)	(1,511)	(2,077)
Interest expense													20,242	18,602	15,541
Other expense/ (income), net													4,037	6,877	2,402
Income before income taxes													115,247	54,708	78,266
Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Net sales													(7,120)
Depreciation and amortization
Operating income (loss)													3,325
Interest income
Interest expense
Other expense/ (income), net
Income before income taxes													3,325
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization													5,018	4,896	6,822
Operating income (loss)													(49,075)	(43,647)	(45,010)
Corporate Expenses [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization
Operating income (loss)
Significant Reconciling Items [Member]
Segment Reporting Information [Line Items]
Interest income													(2,118)	(1,511)	(2,077)
Interest expense													20,242	18,602	15,541
Other expense/ (income), net													4,037	6,877	2,402
Significant Reconciling Items [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Interest income
Interest expense
Other expense/ (income), net
Machine Clothing [Member]
Segment Reporting Information [Line Items]
Net sales													611,858	590,357	582,190
Depreciation and amortization													30,813	33,527	36,428
Operating income (loss)													169,836	153,936	152,505
Machine Clothing [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Net sales													(3,970)
Depreciation and amortization
Operating income (loss)													(1,605)
Engineered Composites [Member]
Segment Reporting Information [Line Items]
Net sales													370,621	273,360	197,649
Depreciation and amortization													43,205	33,533	24,211
Operating income (loss)													16,647	$ (31,657)	$ (15,363)
Engineered Composites [Member] | Increase/(decrease) attributable to application of ASC 606 [Member]
Segment Reporting Information [Line Items]
Net sales													(3,150)
Depreciation and amortization
Operating income (loss)													$ 4,930